Die-casting machine.



L. MQPA K URST. DIE CASTING MACHINE.

APPLICATION FILED FEB. 1, 1912, v

Patented Nov; 26, 1912.

2 SHEETS-SHEBT 1.

. III! IN VEN TOR.

Laj/Ton M. Par/ihursh ATTORNEY. v

L. M. PARKHUR-ST, DiE GASTING MACHINE.

APPLICATION FILED I'EB.1, 1912. 1,045,738.

Patented Nov. 26, 1912.

2 8HEBTSSHEET 2.

Fig-3.

I INVENTOR. QgL/jk/fii;

Lay'l'on Mar/Thur W x ATTORNEY.

forced into the die pnrrnn snares Pa ENT LAYTON M. PARKHURST, F INDIANAPOLIS, INDIANA, ASSIGNOR TO THE INDIANA DIE CASTING DEVELOPMENT COMPANY, .015 INDIANAPOLIS, INDIANA, A COR- PORATION.

DIE-CASTING MACHINE.

Specification of Letters Patent.

Patented Nov. 26, 1912.

Application filed February 1, 1912. Serial No.'674,806.

To all whom- ";tfmay concern:

Be it known that I. Lixr'rox M. Pann- HURST, a citiaen of the United States and a resident of Indianapolis, county of ll'iarion, and State of Indiana, have invented a cer tain useful Die-Castinglllachine; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings.

the construction and operation of die casting machines, whereby in a direct. and positive manner which shall have no deteriorating effect on the metal, such as results when air is used to cause the discharge of the metal into'the' die. The invention is particularly adapted for use with metals having a comparatively low melting point.

The features of the invention lie in providing a die casting nmchine with a lGYOlLL ble metal pot having a discharge passage leading from the lower part thereof and beneath the surface of the metal to which the die is secured and with a plunger within the melting pot which caused to enter said discharge passage as the pot is revolved and force the metal into the die.

The nature of the invention will'be understood from the accompanying drawings andlt-he following description and claims:

In the drawings, Figure 1 is a side-eleva tion. of a die casting machine showing the and there is means for operating the same. Fig. is a vertical section on the line 22 of Fig. 3. Fig. 3-is a vertical transverse section on the line 3 8 of Fig. 1. .Fig. tie the sameas Fig. 3, but with the parts in an op erate'd position. t

In detail there is shown in the drawings adie casting machine having a crucible or melting pct 10 centrally secured within a heatingchamber 11 and revoluble on extensions 12 which have bearings 13 spaced apart by a brace 14. A die is secured upon theoutlet 15from the crucible a plunger 16 in said crucible which is caused to enterthe outlet passage when said crucible is rei'olved to force the lar parts 1'7 hating circular bowl-like inner endswhich together form the chamber 10 for melting and holding the metal. The

The object of this invention is to improve V the molten metal may be I .in the end plates 13.

the plunger vl6 upon in; end plates outlet passage 1-5 is annular and is formed of substantially semi-circular troughs 18, one.

of which is secured to the-inner end of each of the melting pot bowls 17. Said troughs extend for substantially half way about. the melting pot. A pipe 19 is screwed into the upper end of the crucible or melting pot and leads through the heating chamber 11 and upon an annular external projection 20 the lower part 21 of the die is secured, as hereafter described. The lower end of the outlet passage 15 lies below the levelof the metal within said pot except. when said pot is inverted. The pivots 12 secured to the bowls 17 of the melting pot have bearings v Said pivots are centrally bored to receive a shaft 22 which is operated by means of a lever 23, hereafter described, and within the crucible an arm is secured on-the end of which there .is

a curved arm 25 concentric with the shaft and with. the outlet passage 15 and having its end which -isv of the same diameter as the outlet passage 15.

The heating chamber 11 surrounds the melting pot 10 and is secured thereto and upon the upper. side, as shown in Fig.2, there is a yoke extension 26 through which a screw 27 is threaded with a wheel 28 secured thereto within the yoke. The lower half 21 of the die has a conical projection 29 which fits into an opening 30 in the projection 20 from the heating chamber and the upper part- 31 of the die is secured in place by means of said'screw 27 and the hand wheel 28. Upon the lower side of the heating chamber, as shown in Fig. 2, there is a weight 32 to counterbalance the weight of the die and the means for securing the same. The heating chamber 11 is substan-' tially cylindrical in cross section and the open ends are closed Fuel and air are supplied through the pipes 34111141 35. respectively, and enter the heat-' ing chamber through the pipe 36 near the bottom thereof, see Figs. 1 and 2. There is an exhaust opening 37 substantially above the center of said heating chamber and leads to the outer air.

A sprocket wheel 38 is secured upon the left-hand pivot 12 of the melting pot-5 as shown in Fig. 2;. and is driven by means of a chain 39' from a sprocket wheel 40 mounted in connection with a clutch .41 upon a shaft driven from some convenient source by the end plates 13.

of power. A rod-43 is connected to said clutch and to the lower end of the lever 44 fulcrumed at 45 upon a projection 46 from one of the frames 13 and by operating said lever, the sprocket wheel '40 may be operated by the shaft 42 and the heating chamher 11 and melting pot 10 will be revolved.

The construction of theclutch 41 forms no essential part of this invention.

The shaft 22 by which the plunger 16 is operated extends through the right-hand pivot- 12' of the melting pot, see Fl O and c' a upon its end the lever 23 issecured. X01

I mally the lever 23 takes a vertical position to the same.

due to gravity andwhen the melting pot 10 and heating chambers Here in their normal idle positions, the plunger 16 is spaced apart fromthe entrance to the outlet passage 15. The lever 1'45 fulcrumed upon the projection 146 from the right-hand-end plate 13, as shown in Fig. 1, has a spring 47, shown by dotted lines in Figs. 3 and 4, which is se-- plunger 16 and push it to the right slightly,

as shown in Fig. 4. This will also move the lever 23 to-the right and in; engaging the lever 145, willbe retarded somewhat until the end of the arm 23 has slipped from engagement-with said lever 145. This retarding of thearm 23 will cause the plunger 16 to exerta pressure upon the'metal above it and inthe die and will force the same into all parts of the die and give alunifor'm density I claim as invention: 1-. A die casting machine including a cruc1ble having a curved outlet passageway within the same, a plunger located within the crucible and in ali-nemen't with the entrance of the outlet passageway and curved concentrically therewith, one of said elements being rotatably movable relative to' the other so as to cause the plunger to force the molten metal through the outlet passage- Way, and means for securing a die in com-.

munication with the outlet passageway.

.2. A die castingrnachine including a crucible witha circular inner-wall and an outlet thereto, a substantially semicircular pars tition adjacent the inner. wall thereof and with the outletopening forming an outlet passageway, a curved plunger in alinement with the entrance to the outlet-passageway,

means for causing relative move'ment of the bers while the other is crucible and plunger whereby the plunger will enter the outlet, passageway and force the metal therethrough, and means for securing a die to said crucible in commun1ca tion with the outlet therefrom.

3.- A die casting machine including a revoluble crucible having a substantially semicircular outlet passageway therein discharging normally upward, means for securing a die to said crucible in communication-with the outlet passageway, a-shaft extendmg concentrically in the crucible, acurved plun-- gercarried by said shaft withinthe crucible in position to enter the outlet passageway, and means for causing different relative'revoluble movements of the crucible and plunger, whereby said plunger will enter the outlet the di 4. A die casting machine including arevol-uble crucible with a substantially semicircular outlet passageway therein, a die'secured to the crucible in communication with the outlet, a shaft extending into said ermible, a curved plunger in position to" enter the mouth of the outlet passageway, and

passageway and force the metal into means for'yieldingly retarding the revoluble movement of one of 'said revoluble memgiven revoluble movement.

5. die casting machine including a revoluble crucible having a substantially semicircular outlet passageway therein discharg ing normally upward, means for securing a die to said crucible in communication with the outlet passageway, a shaft extending concentrically in the crucible, a curved plunger carried by said shaft within the crucible in position to enter the outlet passageway,

and means for yieldingly resisting the revoluble movement of the plunger as the crucible is given revoluble movement.

6.- A die casting machine including a revoluble crucible having a substantially semicircular outlet passageway therein dischargdie to said crucible in communication with the outlet passageway, a shaft extending concentric-ally in the crucible, a curved plun-' ger carried by said shaft within the crucible in position to enter the outlet passageway, an

'ing normally upward, means for securing a arm extending from the external part of said shaft, and a spring-held bar in the path of saidarm which yieldingly resists the movement of said arm and plunger as the crucible 1s given revoluble movement;

7. A diecasting machine including a rev- .oluble crucible having a substantially semi circular outlet passageway therein discharg ingnonnally upward, means for securinga die to said crucible in communication with the outletpassageway, a shaft extending concentrically in the crucible, a curved pl position to enter the outlet 'passageway,- an:

.. er =carried,by said. shaft within the crucible in ciao oscillatably mounted bar with one end in position to be engaged by said arm, and a sPring holding the other end of said'bar for yieldin 1y resisting the advancing movement 0 said arm as the crucible is given revoluble movement.

8. A die casting machine including a crucible, an external chamber inclosing the crucible, there being a curved outlet passageway in the crucible and leading through the crucible and outer chamber, means for mounting said outer chamberso that it is revoluble, means for securing a die in connection with the outer chamber, means for introducting heatbetween the crucible and the copies of this patent may be obtained for five cents each, by addressing the Commissioner of ratento,

outer chamber without interfering with its revoluble movement, a shaft extending into the crucible, a curved arm secured on the shaft Within the crucible in alinement with the entrance to the out-let chamber, an arm extending from the outlet end of the shaft, and yielding means for resisting the revoluble movement of said arm.

In witness whereof, I have hereunto aflixed my signature in the presence of the witnesses herein named.

LAYTON M. PARKHURST.

Witnesses:

G. H. BOINK, E. H. Mayo.

Washington, D. 0. 

